MQ-3 Alcohol Tester Kit

Working Voltage:5-7.5V DC
PCB Size:6.2*3.6cm

This circuit is mainly an alarm control circuit consisting of the gas sensor group MQ-3. When alcohol vapour is present in the environment where the sensor MQ-3 is located, the conductivity of the sensor will increase as the concentration of alcohol vapour increases. By measuring the series partial voltage between the sensor and the fixed resistor, the alcohol content of the environment can be determined.